51194040121 has 9 divisors (see below), whose sum is σ = 59554093221. Its totient is φ = 43879248252.

The previous prime is 51194040109. The next prime is 51194040197. The reversal of 51194040121 is 12104049115.

The square root of 51194040121 is 226261.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 51194040121 - 2²⁹ = 50657169209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51194040121.

It is not an unprimeable number, because it can be changed into a prime (51194040421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1567666 + ... + 1599988.

It is an arithmetic number, because the mean of its divisors is an integer number (6617121469).

Almost surely, 2^51194040121 is an apocalyptic number.

51194040121 is the 226261-st square number.

51194040121 is the 113131-st centered octagonal number.

It is an amenable number.

51194040121 is a deficient number, since it is larger than the sum of its proper divisors (8360053100).

51194040121 is an frugal number, since it uses more digits than its factorization.

51194040121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64660 (or 32330 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 51194040121 its reverse (12104049115), we get a palindrome (63298089236).

The spelling of 51194040121 in words is "fifty-one billion, one hundred ninety-four million, forty thousand, one hundred twenty-one".